Digital excitation enhances performance and improves diagnostics

The authors describe how new AC generator digital excitation systems are being introduced that provide many advantages over existing systems. Chief among these improvements are advances in performance and diagnostics. In addition to the classic excitation functions, new features provide additional protection. One innovation that has been added to some of the previous limiter functions modifies the pickup point based on external conditions. Additionally, entirely new limiter functions and monitoring capabilities have been added. These enhancements allow the generator to operate closer to its design limit and help keep the unit online during adverse conditions, increasing reliability and reducing down time.